K8S学习之基础四十一：Prometheus基于Pushgateway采集数据

Prometheus基于Pushgateway采集数据

拉取pushgageway镜像，启动容器

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docker pull pushgateway
docker run -d --name pushgateway -p 9091:9091 prom/pushgateway

浏览器查看9091端口

修改prometheus-alertmanager-cfg.yaml文件，在k8s-master节点操作

添加如下job

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- job_name: 'pushgateway'
   scrape_interval: 5s
   static_configs:
   - targets: ['172.18.80.131:9091']
 honor_labels: true

更新配置和deploy

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kubectl apply -f prometheus-alertmanager-pushgateway-cfg.yaml
kubectl delete -f prometheus-alertmanager-deploy.yaml
kubectl apply -f prometheus-alertmanager-deploy.yaml

推送数据到pushgateway

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# 向 {job="test_job"} 添加单条数据：
echo " metric 3.6" | curl --data-binary @- http://172.16.80.131:9091/metrics/job/test_job

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# 添加复杂数据
cat <<EOF | curl --data-binary @- http://172.16.80.131:9091/metrics/job/instance/test_instance
# HELP node_memory_usage The current memory usage.
# TYPE node_memory_usage gauge
node_memory_usage 36
# HELP node_memory_total The total memory available.
# TYPE node_memory_total gauge
node_memory_total 36000
EOF

删除某个组下某个实例的所有数据
curl -X DELETE http://172.16.80.131:9091/metrics/job/test_job/instance/test_instance

删除某个组下的所有数据：
curl -X DELETE http://172.16.80.131:9091/metrics/job/test_job

通过脚本方式上报指标

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#!/bin/bash

# 计算内存使用率，并格式化为两位小数
node_memory_usages=$(free -m | grep Mem | awk '{printf "%.2f", $3/$2*100}')

# 定义 job 和 instance 名称
job_name="memory"
instance_name="172.16.80.131"

# 推送指标数据到 Pushgateway
cat <<EOF | curl --data-binary @- http://172.16.80.131:9091/metrics/job/$job_name/instance/$instance_name
# HELP node_memory_usages The percentage of memory usage.
# TYPE node_memory_usages gauge
node_memory_usages $node_memory_usages
EOF

sh push_memory.sh
# 可以配置定时任务，每隔多长时间获取一次